2157640814 has 16 divisors (see below), whose sum is σ = 3774300000. Its totient is φ = 924702912.

The previous prime is 2157640801. The next prime is 2157640843. The reversal of 2157640814 is 4180467512.

2157640814 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1571939 + ... + 1573310.

It is an arithmetic number, because the mean of its divisors is an integer number (235893750).

Almost surely, 2^2157640814 is an apocalyptic number.

2157640814 is a deficient number, since it is larger than the sum of its proper divisors (1616659186).

2157640814 is an equidigital number, since it uses as much as digits as its factorization.

2157640814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3145272 (or 3145258 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 38.

The square root of 2157640814 is about 46450.4124201282. The cubic root of 2157640814 is about 1292.1900210788.

The spelling of 2157640814 in words is "two billion, one hundred fifty-seven million, six hundred forty thousand, eight hundred fourteen".